Assay (Arg.).......................................................................................99 %

pH of 5% solution.......................................................................... 4,5-6,0

Insoluble matter in H2O................................................................... 0,02 %

Residue on ignition (as SO4)............................................................. 0,1 %

Chloride (Cl).................................................................................... 0,01 %

Sulphate (SO4)................................................................................ 0,01 %

Sulphide (S).................................................................................. 0,005 %

Heavy metals (as Pb).................................................................... 0,002 %

Cu................................................................................................. 0,001 %

Fe.................................................................................................. 0,001 %

Ni.................................................................................................. 0,001 %

Pb................................................................................................. 0,001 %